Omega-3 Fats: An Inflammatory Bowel Disaster

Physionic

Apr 2, 2026

Episode description

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0:00 - Introduction
1:05 - RXRa: You’re being Naughty
3:28 - Polyunsaturated Fats: Not so Good looking Now, eh?
5:47 - Many Holes in the Message

References
[Study 686] Meyer M, Grabherr F, Plattner C, et al. Metabolic stress sensing by epithelial RXRα links westernization of diet with Crohn’s disease. Cell Metab. 2026;38:1-17. doi:10.1016/j.cmet.2025.11.008

Funding/Conflict: Public Funding: From the accessible funding disclosure, this work was supported by the German Research Foundation (DFG), including individual grant SO1141/10-1 and Research Unit FOR5042, and by grant K126408 to F.S. Non-Profit Funding: From the accessible funding disclosure, support was also reported from the Austrian Society of Gastroenterology and Hepatology to L.M. and the European Crohn’s and Colitis Organisation (ECCO) to F.G. Industry Funding: From the accessible funding disclosure, I did not find any industry funding reported. Conflicts of Interest: From the study, the authors declared no competing interests.

[Study 687] Ananthakrishnan AN, Khalili H, Konijeti GG, et al. Long-term intake of dietary fat and risk of ulcerative colitis and Crohn's disease. Gut. 2014;63(5):776-784. doi:10.1136/gutjnl-2013-305304

[Study 688] Lev-Tzion R, Griffiths AM, Ledder O, Turner D. Omega-3 fatty acids (fish oil) for maintenance of remission in Crohn’s disease. Cochrane Database Syst Rev. 2014;(2): CD006320. doi:10.1002/14651858.CD006320.pub4

Funding/Conflict: Public Funding: From the study, this work was supported by the National Institutes of Health through K24 DK098311, P01 CA87969, P30 DK043351, K08 DK064256, K23 DK091742, K23 DK099681, and UM1 CA176276. Non-Profit Funding: From the study, support was also reported from a Research Scholars Award of the American Gastroenterological Association, the Crohn’s and Colitis Foundation of America, and the Broad Medical Research Program of the Broad Foundation. Industry Funding: From the study, no industry funding was reported. Conflicts of Interest: From the study, Ashwin N. Ananthakrishnan reported serving on the scientific advisory boards of Prometheus Inc. and Janssen Inc.; James M. Richter reported being a consultant for Policy Analysis, Inc.; Andrew T. Chan reported consulting for Bayer HealthCare, Millennium Pharmaceuticals, Pfizer Inc., and Pozen Inc.; the other listed authors reported no disclosures.

[Study 689] Chan SSM, Luben R, Olsen A, et al. Association between high dietary intake of the n-3 polyunsaturated fatty acid docosahexaenoic acid and reduced risk of Crohn’s disease. Aliment Pharmacol Ther. 2014;39:834-842. doi:10.1111/apt.12670

Funding/Conflict: Public Funding: From the study, public support was reported from The NHS Executive Eastern Region, an NIHR clinical lectureship for S.S.M.C., the European Commission (DG-SANCO), the International Agency for Research on Cancer, the Federal Ministry of Education and Research in Germany, the Dutch Ministry of Health, Welfare and Sports, Dutch ZON (Zorg Onderzoek Nederland), Statistics Netherlands, the Swedish Scientific Council, the Regional Government of Skane and Västerbotten, and the UK Medical Research Council; Non-Profit Funding: From the study, non-profit support was reported from The Sir Halley Stewart Trust, Crohn’s and Colitis UK, the Danish Cancer Society, German Cancer Aid, Dutch Prevention Funds, LK Research Funds, the World Cancer Research Fund, the Swedish Cancer Society, and Cancer Research UK; Industry Funding: From the study, no industry funding was reported; Conflicts of Interest: From the study, the declaration of personal interests was none.

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Mindsip insights from this episode:

Incorporate omega-3s to support IBD remission

Meta-analyses show that omega-3 consumption can reduce the risk of inflammatory events for people with Crohn's disease who are in remission.

Target RXR alpha to reduce inflammation in IBD patients

People with Inflammatory Bowel Disease (IBD) have high activity of a protein called RXR alpha in their intestines, which is linked to more inflammation.

Consider diet context when evaluating omega-3s for IBD patients

The potential harm from omega-3s in IBD patients appears to be primarily in the context of a poor, high-fat, high-calorie Western diet.

Reevaluate omega-3s for potential inflammatory effects

Contrary to popular belief, polyunsaturated fats like omega-3s can bind to the RXR alpha protein, potentially increasing its inflammatory activity in the gut.

Consume omega-3s to lower IBD risk

For people who do not have IBD, consuming omega-3s is still associated with a reduced risk of developing conditions like ulcerative colitis and Crohn's disease.

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